After the verb gṝ 'to swallow', when preceded by sam , the ātmanepada affix is used in the sense of 'promising'.,
As शनं संगिरते, 'he promises to pay a hundred rupees.' If it does not mean to promise or acknowledge, it takes parasmaipada terminations. As संगिरति ग्रासम्, 'he swallows the mouthful.',